Sorry to be a while getting back to you, but thanks for the bug report. You have probably figured out that you need a SURFACE_SPECIES keyword separating the aqueous species from the surface species: SOLUTION_MASTER_SPECIES Naph Naph 0 128.18 128.18 SOLUTION_SPECIES Naph = Naph log_k 0 SURFACE_SPECIES Hfo_wOH = Hfo_wOH log_k 0.0 I have modified the program trap the error and write an error message, which should be in version 2.9 whenever it comes out. Thanks, David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled
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